Microsoft/TypeScript

Enum types are not checked in binary operators

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#3,845 建立於 2015年7月13日

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 (5 留言) (0 反應) (0 負責人)TypeScript (48,455 star) (6,726 fork)batch import
Breaking ChangeBugDomain: enumHelp Wanted

描述

I ran into this for real while trying to fix a bug in the compiler. We disallow assigning one enum to another if you use the = operator. But we do not disallow it for any of the compound assignment operators. Nor do we disallow for bitwise operators. I think we should disallow all of them.

enum E { }
enum F { }

var e: E;
var f: F;

e = f; // Error
e |= f; // No error
var g = e | f; // No error, g is number

貢獻者指南

技術棧
typescript
領域
tooling
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Basic understanding of TypeScript's type systemFamiliarity with compiler source code
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
30
研究方向
The issue describes that enum type checking is missing for compound assignment operators (e.g., |=) and bitwise operators. To fix this, locate the type checking logic for binary operators in the TypeScript compiler, likely in checker.ts. Study how the '=' operator checks enum types and extend that logic to other operators. Check for any existing test cases for enum assignment to ensure consistency.
Enum types are not checked in binary operators · Microsoft/TypeScript#3845 | Good First Issue